Characters needed for urdu

What all characters are needed for an urdu font? In the list for urdu some characters such as Alef are missing and instead are in the arabic glyph list. Is there a list of the characters and glyphs used in urdu fonts?

These are the additional glyphs you need for Urdu. You would add Arabic glyphs, and also the Urdu glyphs.

I will close this thread, because there are several others already about this, e.g.:

https://forum.glyphsapp.com/t/urdu-arabic-font-in-nastaliq-script/

Or search for Urdu in the forum.